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Finding the Fourth Proportional to 43,278.80, 64,929.02 and 12,113.80

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Solution

The fourth proportional to 43,278.80, 64,929.02 and 12,113.80 is: 18,173.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,278.80 : 64,929.02 = 12,113.80 : x
  2. Step 2: Convert to fraction form
    43,278.80/64,929.02 = 12,113.80/x
  3. Step 3: Cross multiply
    43,278.80x = 64,929.02 × 12,113.80
  4. Step 4: Simplify right side
    43,278.80x = 786,537,162.48
  5. Step 5: Solve for x
    x = 786,537,162.48/43,278.80
  6. Step 6: Final answer
    x = 18,173.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.